| 摘要 |
<p>A card-type storage medium (1) accessible from plural applications simultaneously has a storage unit (2), a communication control unit (3) and a file access control unit (4). The communication control unit (3) includes a command multiplex reception control unit (5) for accepting a command on occasion received from the outside, while successively requiring said file access control unit (4) to perform a command process according to the command accepted. The file access control unit (4) includes an access exclusive control unit (6) for performing control so as to inhibit an access to a file unit that is an object of a command process required by said command multiplex reception control unit (5) if the file unit is already an object of an access from another command process. The card-type storage medium may be adapted to an IC card or an optical card which is necessary to comply with diversification or sophistication of users' demands. <IMAGE></p> |
